* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: linear-gradient(135deg, #2575fc, #6a11cb);
    overflow: hidden;
    position: relative;
}

/* 粒子背景容器 */
#particles-js {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    z-index: 1;
}

.container {
    position: relative;
    z-index: 2;
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
    max-width: 420px;
    padding: 40px 30px;
    background: rgba(255, 255, 255, 0.95);
    border-radius: 16px;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.25);
    backdrop-filter: blur(10px);
    transition: transform 0.3s ease;
}

.container:hover {
    transform: translateY(-5px);
}

.logo {
    display: flex;
    align-items: center;
    margin-bottom: 30px;
}

.logo-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, #00a1d6, #fb7299);
    border-radius: 12px;
    display: flex;
    justify-content: center;
    align-items: center;
    margin-right: 15px;
}

.logo-icon i {
    font-size: 28px;
    color: white;
}

.logo-text {
    font-size: 28px;
    font-weight: 700;
    background: linear-gradient(135deg, #00a1d6, #fb7299);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.logo-text span {
    font-size: 18px;
    color: #666;
    display: block;
    margin-top: 4px;
    font-weight: 400;
    background: none;
    -webkit-text-fill-color: #666;
}

h2 {
    color: #333;
    margin-bottom: 30px;
    font-size: 24px;
    font-weight: 600;
}

.input-group {
    position: relative;
    width: 100%;
    margin-bottom: 25px;
}

.input-group i {
    position: absolute;
    left: 15px;
    top: 50%;
    transform: translateY(-50%);
    color: #888;
    font-size: 18px;
}

.input-group input {
    width: 100%;
    padding: 15px 15px 15px 50px;
    border: 2px solid #e0e0e0;
    border-radius: 12px;
    font-size: 16px;
    transition: all 0.3s ease;
    outline: none;
}

.input-group input:focus {
    border-color: #00a1d6;
    box-shadow: 0 0 0 3px rgba(0, 161, 214, 0.2);
}

.btn {
    width: 100%;
    padding: 15px;
    border: none;
    border-radius: 12px;
    background: linear-gradient(135deg, #00a1d6, #fb7299);
    color: white;
    font-size: 18px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 5px 15px rgba(251, 114, 153, 0.4);
}

.btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(251, 114, 153, 0.6);
}

@media (max-width: 480px) {
    .container {
        width: 90%;
        padding: 30px 20px;
    }

    .logo-text {
        font-size: 24px;
    }

    h2 {
        font-size: 20px;
    }
}